Steam-generator.



PATENTED DEG. 12, 1905.

P. STOLTZ. STEAM GENERATOR.

APPLIOATION HLED MAY6,1904.

2 SHEETS-SHEET 1.

I PATENTED DEG. 12, 1905.

` E. sToLTZ.

STEAM GENERATOR.

APPLICATION FILED MAYG, 1904.

2 SHEETS-SHEET 2.l

UNITED STATIlS PATENT STEAM-GENERATOR.

ivo. sor-,137.

Specification of Letters Patent.

Patented Dec. 12, 1905.

I Application filed May 6, 1904. Serial No. 206,650.

To a/ZZ whom t may concern:

Beit known that I, PETER S'roL'rz, engineer, a subjectof the German Emperor, residing at 138 Friedrichstrasse, Berlin, in the Empire of.

Germany, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention is an improvement in that class of steam-generators in which a group of superheating-pipes is arranged between vaporizing drums or cylinders.

I have devised certain peculiarities of construction, arrangement, and combination of parts whereby advantages or improved results are attained, as hereinafter set forth. Contrary to what is the case with the known arrangements-in accordance with which, for example, water-tubes and superheater-tubes are arranged in groups above each other, side by side, or in succession-in the ,present invention the superheater-tubes arev mounted in vertical groups between the tubular, fiat, andtainable heating of the steam. The best possible superheating can only be obtained if the hot gases act upon the superheater in the hottest possible condition. In the present case the action of the hot gases is available both for the heating of the tubular sections generating the steam and also for the heating of l the tubular groups of the superheater.

.deflected against the walls of the tubular sections in a manner favorable to utilizingthem `to the utmost. `The arrangement of the superheater-tubes is therefore also a means for increasing' the eiiiciency of the steam-generator, and this with a comparatively small increase in the volume of this latter. This increase in volume is very small, because it is necessary, even if superheaters are not employed, to keep the tubular sections at a certain distance from each other, and it is only requisite to very slightly increase this interval. This effective utilization of space is of great importance in the case of ships, motors, &c. On the other hand, it is an advantage that the tubular sections, owing to the superheater-tubes, can be arranged at a somewhat greater interval from each other Without malring the cross-section of the heat-passages between the tubes too great, whereby the velocity of the ascending gases would become too small, because the cross-section of the superheater-tubes decreases the cross-section of the passage between the tubular sections by the proper amount. @wing to the somewhat larger interval, the joints are rendered more accessible where the tubular sections are connected with the steam and Water chambers; further, the assemblage is facilitated and the possibility is obtained of providing a larger grate area and a larger heating appliance. If there were no superheater-tubes between the tubular sections and these latter had consequently to be arranged closer together, the furnace or grate area would have to be correspondingly smaller. Owing to the arrangement of the superheater, the grate-surface is therefore increased. In order to efliciently utilize the steam, it is before all things important that the superheater-tubes should be in contact with a portion of the hot gases in their hottest condition-that is to say, before they have given up any or much of their heat-so that the superheating-may be very high.

In the accompanying drawings, Figures 1 to 3 show a constructional form of the steamgenerator with the superheater-that is to say, Fig. 1 is a front elevation showing some parts in section. Fig. 2 is a side elevation. Fig. 3 is a plan view, partly in section, taken on the line I II of Fig. 1. Fig. l shows diagrammatically the action of the interposition of the superheater-tubes. Figs. 4 and 5 illustrate an altered arrangement of the superheater-tubes, Fig. 5 being a partial section on the line III IV of Fig. 4. Figs. 6 and 7sh0w another modified arrangement of the superheater-tubes, Fig. 7 being a section on the ICO line V VI of Fig. 6. Figs. 8 and 9 illustrate two further arrangements of the superheatertubes.

The sections or tubular plates 1, which are provided in the known manner with the upwardly-proceeding longitudinal passages 2, connected with each other by transverse passages, are connected below by means of joints 3 with the water-reservoir 5 and above by means of joints 4 with the steam-chamber 6. rI`he water is distributed from the water-reservoir 5 (which is supplied by the conduit 16) to the separate tubular sections, while the steam is conducted from the steam-chamber 6 to the superheater. In the arrangement represented in Figs. l to 3 this takes place by means of the connecting-tube 7, to which the superheater sections or coils 8 are connected. These latter wind in horizontal convolutions between the separate tubular sections, as shown in plan in Fig. 3. From these coils the steam passes into a collecting-tube 9, from which it is conducted by the supply-pipe 10 to the point at which it is to be utilized.

The arrangement which has been described presents the advantage that all the convolutions of each of the separate coils always lie at the same height above the furnace-for example, above the gas-heating burners shown at 11 in Fig. 1. In many cases this may be advantageous, especially when it is desired to obtain steam su perheated to dilerent degrees. In such a case the more highly superheated steam is taken from the lower superheatingtubes and the less highly heated from the upper tubes, as desired.

For the generation of steam in the tubular sections it is important that the superheatingconduits lying horizontally between the tubular sections should oier resistance to the ascending hot gases, as is shown by the partial section in Fig. 1. In the diagrammatic representation in Fig. 1a the arrows indicate the wave-like upward movement of the hot gases, resulting from the narrowing of the hot-gas passages by the tubes. By 4this means the gases impinge against the superheater-tuhes and against the walls of the tubular sections in a manner advantageous for yielding up their heat. Increased generation of steam therefore takes place.

rIhe modications illustrated in Figs. 4 and 5 and in Figs. 6 and 7 differ from the construction described above, owing to the fact that the separate coils do not pass transversely through the intervals of all the sections, but between every two sections a coil is arranged, the lengths of which may lie vertically, as in Figs. 4L and 5, or horizontally, as shown in Figs. 6 and 7.

While in accordance with Figs. 1 to 3 the superheating-coils pass in horizontal convolutions between the sections, the superheatingcoils may also pass with vertical lengths through the intervals between the tubular sections, as shown in Fig. 8. While also in Figs. 1 to 3 all the coils are arranged parallel, in many cases it maybe advantageous to arrange them in succession. In this case either all the superheating lengths may be arranged in succession or the arrangement in series' maybe eected in groups. Furthermore, the steam to he superheated may be conducted in the same direction or as acounter-current relatively to the ascendinghot gases. In some cases it may be desirable to use partly a counter-current and partly a like current. Fig. 9 shows an example of this latter arrangement. The steam passes first of all through the conduit l2 into the lower lengths of tube 13, through which the steam flows with a like current to the hot gases. The steam is then conducted upward by means of the conduit 14: through the lengths 15, through which the steam Hows in counter-current to the hot gases.

The opposed parallel sides of the tubular sections may be plane, as shown in several figures, or corrugated, as shown in Fig. 5, and while the horizontal parallel arrangement of the superheater-tubes (shown in Figs. l, 2, 3) is preferred and most advantageous I may in some cases arrange them otherwise, as above intimated. In any event it is necessary that the superheater-tu bes should be arranged in grou ps between the separate groups of tubes, so that the steam-generator and the superheater are arranged in the same space, as it is owing to this construction that the advantages enumerated above are obtained. Between each two tubular plates the groups of tubes might also be arranged in two or more vertical layers.

/Vhat I claim, and desire to secure by Letters Patent of the United States,`is-

1. The improved steam-generator comprising a series or group of at tubular sections, arranged parallel vertically, and separated by narrow spaces which are open at the bottom to admit flame and heated gases of combustion, a water-supply pipe, arranged at the bottom and along one side of the series of tubular sections and having a series of tubes each communicating with one of said sections, a steam-collecting pipe arranged at the top of the series of sections and pipes connecting the same, said pipe extending down on the side of the series of tubular sections, and a series of steam-superheating tubes attached to such depending pipe and extending in convolutions in the vertical spaces between the several tubular sections, the convolutions being thus arranged parallel one above another, and a collecting-pipe with which the several superheating-tubes connectafter passing through the spaces between the sections, as shown and described.

2. The improved generator, comprising a series of flat tubular sections arranged parallel vertically and separated by narrow spaces which are open at the bottom, and a series IOO IIO

tween the several sections, their coils or convolutions being arranged one above another in such spaces, and collecting-pipe with which such tubes are connected at their ends, and a water-supply tube connected with all the sections at their lower ends, and a heating rnedium arranged below the group or series of sections, as shown and described.

In testimony whereof I have hereunto set my hand, in presence of two subscribing witnesses, this 19th day of April, 1904.

' PETER STOLTZ. Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

